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path: root/plugins/gme/Game_Music_Emu-0.5.2/gme/Gb_Cpu.cpp
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Diffstat (limited to 'plugins/gme/Game_Music_Emu-0.5.2/gme/Gb_Cpu.cpp')
-rw-r--r--plugins/gme/Game_Music_Emu-0.5.2/gme/Gb_Cpu.cpp1056
1 files changed, 0 insertions, 1056 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/gme/Gb_Cpu.cpp b/plugins/gme/Game_Music_Emu-0.5.2/gme/Gb_Cpu.cpp
deleted file mode 100644
index b1f22bd9..00000000
--- a/plugins/gme/Game_Music_Emu-0.5.2/gme/Gb_Cpu.cpp
+++ /dev/null
@@ -1,1056 +0,0 @@
-// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/
-
-#include "Gb_Cpu.h"
-
-#include <string.h>
-
-//#include "gb_cpu_log.h"
-
-/* Copyright (C) 2003-2006 Shay Green. This module is free software; you
-can redistribute it and/or modify it under the terms of the GNU Lesser
-General Public License as published by the Free Software Foundation; either
-version 2.1 of the License, or (at your option) any later version. This
-module is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
-details. You should have received a copy of the GNU Lesser General Public
-License along with this module; if not, write to the Free Software Foundation,
-Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
-
-#include "gb_cpu_io.h"
-
-#include "blargg_source.h"
-
-// Common instructions:
-//
-// 365880 FA LD A,IND16
-// 355863 20 JR NZ
-// 313655 21 LD HL,IMM
-// 274580 28 JR Z
-// 252878 FE CMP IMM
-// 230541 7E LD A,(HL)
-// 226209 2A LD A,(HL+)
-// 217467 CD CALL
-// 212034 C9 RET
-// 208376 CB CB prefix
-//
-// 27486 CB 7E BIT 7,(HL)
-// 15925 CB 76 BIT 6,(HL)
-// 13035 CB 19 RR C
-// 11557 CB 7F BIT 7,A
-// 10898 CB 37 SWAP A
-// 10208 CB 66 BIT 4,(HL)
-
-#if BLARGG_NONPORTABLE
- #define PAGE_OFFSET( addr ) (addr)
-#else
- #define PAGE_OFFSET( addr ) ((addr) & (page_size - 1))
-#endif
-
-inline void Gb_Cpu::set_code_page( int i, uint8_t* p )
-{
- state->code_map [i] = p - PAGE_OFFSET( i * (blargg_long) page_size );
-}
-
-void Gb_Cpu::reset( void* unmapped )
-{
- check( state == &state_ );
- state = &state_;
-
- state_.remain = 0;
-
- for ( int i = 0; i < page_count + 1; i++ )
- set_code_page( i, (uint8_t*) unmapped );
-
- memset( &r, 0, sizeof r );
- //interrupts_enabled = false;
-
- blargg_verify_byte_order();
-}
-
-void Gb_Cpu::map_code( gb_addr_t start, unsigned size, void* data )
-{
- // address range must begin and end on page boundaries
- require( start % page_size == 0 );
- require( size % page_size == 0 );
-
- unsigned first_page = start / page_size;
- for ( unsigned i = size / page_size; i--; )
- set_code_page( first_page + i, (uint8_t*) data + i * page_size );
-}
-
-#define READ( addr ) CPU_READ( this, (addr), s.remain )
-#define WRITE( addr, data ) {CPU_WRITE( this, (addr), (data), s.remain );}
-#define READ_FAST( addr, out ) CPU_READ_FAST( this, (addr), s.remain, out )
-#define READ_PROG( addr ) (s.code_map [(addr) >> page_shift] [PAGE_OFFSET( addr )])
-
-unsigned const z_flag = 0x80;
-unsigned const n_flag = 0x40;
-unsigned const h_flag = 0x20;
-unsigned const c_flag = 0x10;
-
-bool Gb_Cpu::run( blargg_long cycle_count )
-{
- state_.remain = blargg_ulong (cycle_count + clocks_per_instr) / clocks_per_instr;
- state_t s;
- this->state = &s;
- memcpy( &s, &this->state_, sizeof s );
-
- typedef BOOST::uint16_t uint16_t;
-
-#if BLARGG_BIG_ENDIAN
- #define R8( n ) (r8_ [n])
-#elif BLARGG_LITTLE_ENDIAN
- #define R8( n ) (r8_ [(n) ^ 1])
-#else
- #error "Byte order of CPU must be known"
-#endif
-
- union {
- core_regs_t rg; // individual registers
-
- struct {
- BOOST::uint16_t bc, de, hl, unused; // pairs
- } rp;
-
- uint8_t r8_ [8]; // indexed registers (use R8 macro due to endian dependence)
- BOOST::uint16_t r16 [4]; // indexed pairs
- };
- BOOST_STATIC_ASSERT( sizeof rg == 8 && sizeof rp == 8 );
-
- rg = r;
- unsigned pc = r.pc;
- unsigned sp = r.sp;
- unsigned flags = r.flags;
-
-loop:
-
- check( (unsigned long) pc < 0x10000 );
- check( (unsigned long) sp < 0x10000 );
- check( (flags & ~0xF0) == 0 );
-
- uint8_t const* instr = s.code_map [pc >> page_shift];
- unsigned op;
-
- // TODO: eliminate this special case
- #if BLARGG_NONPORTABLE
- op = instr [pc];
- pc++;
- instr += pc;
- #else
- instr += PAGE_OFFSET( pc );
- op = *instr++;
- pc++;
- #endif
-
-#define GET_ADDR() GET_LE16( instr )
-
- if ( !--s.remain )
- goto stop;
-
- unsigned data;
- data = *instr;
-
- #ifdef GB_CPU_LOG_H
- gb_cpu_log( "new", pc - 1, op, data, instr [1] );
- #endif
-
- switch ( op )
- {
-
-// TODO: more efficient way to handle negative branch that wraps PC around
-#define BRANCH( cond )\
-{\
- pc++;\
- int offset = (BOOST::int8_t) data;\
- if ( !(cond) ) goto loop;\
- pc = uint16_t (pc + offset);\
- goto loop;\
-}
-
-// Most Common
-
- case 0x20: // JR NZ
- BRANCH( !(flags & z_flag) )
-
- case 0x21: // LD HL,IMM (common)
- rp.hl = GET_ADDR();
- pc += 2;
- goto loop;
-
- case 0x28: // JR Z
- BRANCH( flags & z_flag )
-
- {
- unsigned temp;
- case 0xF0: // LD A,(0xFF00+imm)
- temp = data | 0xFF00;
- pc++;
- goto ld_a_ind_comm;
-
- case 0xF2: // LD A,(0xFF00+C)
- temp = rg.c | 0xFF00;
- goto ld_a_ind_comm;
-
- case 0x0A: // LD A,(BC)
- temp = rp.bc;
- goto ld_a_ind_comm;
-
- case 0x3A: // LD A,(HL-)
- temp = rp.hl;
- rp.hl = temp - 1;
- goto ld_a_ind_comm;
-
- case 0x1A: // LD A,(DE)
- temp = rp.de;
- goto ld_a_ind_comm;
-
- case 0x2A: // LD A,(HL+) (common)
- temp = rp.hl;
- rp.hl = temp + 1;
- goto ld_a_ind_comm;
-
- case 0xFA: // LD A,IND16 (common)
- temp = GET_ADDR();
- pc += 2;
- ld_a_ind_comm:
- READ_FAST( temp, rg.a );
- goto loop;
- }
-
- case 0xBE: // CMP (HL)
- data = READ( rp.hl );
- goto cmp_comm;
-
- case 0xB8: // CMP B
- case 0xB9: // CMP C
- case 0xBA: // CMP D
- case 0xBB: // CMP E
- case 0xBC: // CMP H
- case 0xBD: // CMP L
- data = R8( op & 7 );
- goto cmp_comm;
-
- case 0xFE: // CMP IMM
- pc++;
- cmp_comm:
- op = rg.a;
- data = op - data;
- sub_set_flags:
- flags = ((op & 15) - (data & 15)) & h_flag;
- flags |= (data >> 4) & c_flag;
- flags |= n_flag;
- if ( data & 0xFF )
- goto loop;
- flags |= z_flag;
- goto loop;
-
- case 0x46: // LD B,(HL)
- case 0x4E: // LD C,(HL)
- case 0x56: // LD D,(HL)
- case 0x5E: // LD E,(HL)
- case 0x66: // LD H,(HL)
- case 0x6E: // LD L,(HL)
- case 0x7E:{// LD A,(HL)
- unsigned addr = rp.hl;
- READ_FAST( addr, R8( (op >> 3) & 7 ) );
- goto loop;
- }
-
- case 0xC4: // CNZ (next-most-common)
- pc += 2;
- if ( flags & z_flag )
- goto loop;
- call:
- pc -= 2;
- case 0xCD: // CALL (most-common)
- data = pc + 2;
- pc = GET_ADDR();
- push:
- sp = (sp - 1) & 0xFFFF;
- WRITE( sp, data >> 8 );
- sp = (sp - 1) & 0xFFFF;
- WRITE( sp, data & 0xFF );
- goto loop;
-
- case 0xC8: // RNZ (next-most-common)
- if ( !(flags & z_flag) )
- goto loop;
- case 0xC9: // RET (most common)
- ret:
- pc = READ( sp );
- pc += 0x100 * READ( sp + 1 );
- sp = (sp + 2) & 0xFFFF;
- goto loop;
-
- case 0x00: // NOP
- case 0x40: // LD B,B
- case 0x49: // LD C,C
- case 0x52: // LD D,D
- case 0x5B: // LD E,E
- case 0x64: // LD H,H
- case 0x6D: // LD L,L
- case 0x7F: // LD A,A
- goto loop;
-
-// CB Instructions
-
- case 0xCB:
- pc++;
- // now data is the opcode
- switch ( data ) {
-
- {
- int temp;
- case 0x46: // BIT b,(HL)
- case 0x4E:
- case 0x56:
- case 0x5E:
- case 0x66:
- case 0x6E:
- case 0x76:
- case 0x7E:
- {
- unsigned addr = rp.hl;
- READ_FAST( addr, temp );
- goto bit_comm;
- }
-
- case 0x40: case 0x41: case 0x42: case 0x43: // BIT b,r
- case 0x44: case 0x45: case 0x47: case 0x48:
- case 0x49: case 0x4A: case 0x4B: case 0x4C:
- case 0x4D: case 0x4F: case 0x50: case 0x51:
- case 0x52: case 0x53: case 0x54: case 0x55:
- case 0x57: case 0x58: case 0x59: case 0x5A:
- case 0x5B: case 0x5C: case 0x5D: case 0x5F:
- case 0x60: case 0x61: case 0x62: case 0x63:
- case 0x64: case 0x65: case 0x67: case 0x68:
- case 0x69: case 0x6A: case 0x6B: case 0x6C:
- case 0x6D: case 0x6F: case 0x70: case 0x71:
- case 0x72: case 0x73: case 0x74: case 0x75:
- case 0x77: case 0x78: case 0x79: case 0x7A:
- case 0x7B: case 0x7C: case 0x7D: case 0x7F:
- temp = R8( data & 7 );
- bit_comm:
- int bit = (~data >> 3) & 7;
- flags &= ~n_flag;
- flags |= h_flag | z_flag;
- flags ^= (temp << bit) & z_flag;
- goto loop;
- }
-
- case 0x86: // RES b,(HL)
- case 0x8E:
- case 0x96:
- case 0x9E:
- case 0xA6:
- case 0xAE:
- case 0xB6:
- case 0xBE:
- case 0xC6: // SET b,(HL)
- case 0xCE:
- case 0xD6:
- case 0xDE:
- case 0xE6:
- case 0xEE:
- case 0xF6:
- case 0xFE: {
- int temp = READ( rp.hl );
- int bit = 1 << ((data >> 3) & 7);
- temp &= ~bit;
- if ( !(data & 0x40) )
- bit = 0;
- WRITE( rp.hl, temp | bit );
- goto loop;
- }
-
- case 0xC0: case 0xC1: case 0xC2: case 0xC3: // SET b,r
- case 0xC4: case 0xC5: case 0xC7: case 0xC8:
- case 0xC9: case 0xCA: case 0xCB: case 0xCC:
- case 0xCD: case 0xCF: case 0xD0: case 0xD1:
- case 0xD2: case 0xD3: case 0xD4: case 0xD5:
- case 0xD7: case 0xD8: case 0xD9: case 0xDA:
- case 0xDB: case 0xDC: case 0xDD: case 0xDF:
- case 0xE0: case 0xE1: case 0xE2: case 0xE3:
- case 0xE4: case 0xE5: case 0xE7: case 0xE8:
- case 0xE9: case 0xEA: case 0xEB: case 0xEC:
- case 0xED: case 0xEF: case 0xF0: case 0xF1:
- case 0xF2: case 0xF3: case 0xF4: case 0xF5:
- case 0xF7: case 0xF8: case 0xF9: case 0xFA:
- case 0xFB: case 0xFC: case 0xFD: case 0xFF:
- R8( data & 7 ) |= 1 << ((data >> 3) & 7);
- goto loop;
-
- case 0x80: case 0x81: case 0x82: case 0x83: // RES b,r
- case 0x84: case 0x85: case 0x87: case 0x88:
- case 0x89: case 0x8A: case 0x8B: case 0x8C:
- case 0x8D: case 0x8F: case 0x90: case 0x91:
- case 0x92: case 0x93: case 0x94: case 0x95:
- case 0x97: case 0x98: case 0x99: case 0x9A:
- case 0x9B: case 0x9C: case 0x9D: case 0x9F:
- case 0xA0: case 0xA1: case 0xA2: case 0xA3:
- case 0xA4: case 0xA5: case 0xA7: case 0xA8:
- case 0xA9: case 0xAA: case 0xAB: case 0xAC:
- case 0xAD: case 0xAF: case 0xB0: case 0xB1:
- case 0xB2: case 0xB3: case 0xB4: case 0xB5:
- case 0xB7: case 0xB8: case 0xB9: case 0xBA:
- case 0xBB: case 0xBC: case 0xBD: case 0xBF:
- R8( data & 7 ) &= ~(1 << ((data >> 3) & 7));
- goto loop;
-
- {
- int temp;
- case 0x36: // SWAP (HL)
- temp = READ( rp.hl );
- goto swap_comm;
-
- case 0x30: // SWAP B
- case 0x31: // SWAP C
- case 0x32: // SWAP D
- case 0x33: // SWAP E
- case 0x34: // SWAP H
- case 0x35: // SWAP L
- case 0x37: // SWAP A
- temp = R8( data & 7 );
- swap_comm:
- op = (temp >> 4) | (temp << 4);
- flags = 0;
- goto shift_comm;
- }
-
-// Shift/Rotate
-
- case 0x06: // RLC (HL)
- case 0x16: // RL (HL)
- case 0x26: // SLA (HL)
- op = READ( rp.hl );
- goto rl_comm;
-
- case 0x20: case 0x21: case 0x22: case 0x23: case 0x24: case 0x25: case 0x27: // SLA A
- case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: case 0x07: // RLC A
- case 0x10: case 0x11: case 0x12: case 0x13: case 0x14: case 0x15: case 0x17: // RL A
- op = R8( data & 7 );
- goto rl_comm;
-
- case 0x3E: // SRL (HL)
- data += 0x10; // bump up to 0x4n to avoid preserving sign bit
- case 0x1E: // RR (HL)
- case 0x0E: // RRC (HL)
- case 0x2E: // SRA (HL)
- op = READ( rp.hl );
- goto rr_comm;
-
- case 0x38: case 0x39: case 0x3A: case 0x3B: case 0x3C: case 0x3D: case 0x3F: // SRL A
- data += 0x10; // bump up to 0x4n
- case 0x18: case 0x19: case 0x1A: case 0x1B: case 0x1C: case 0x1D: case 0x1F: // RR A
- case 0x08: case 0x09: case 0x0A: case 0x0B: case 0x0C: case 0x0D: case 0x0F: // RRC A
- case 0x28: case 0x29: case 0x2A: case 0x2B: case 0x2C: case 0x2D: case 0x2F: // SRA A
- op = R8( data & 7 );
- goto rr_comm;
-
- } // CB op
- assert( false ); // unhandled CB op
-
- case 0x07: // RLCA
- case 0x17: // RLA
- data = op;
- op = rg.a;
- rl_comm:
- op <<= 1;
- op |= ((data & flags) >> 4) & 1; // RL and carry is set
- flags = (op >> 4) & c_flag; // C = bit shifted out
- if ( data < 0x10 ) // RLC
- op |= op >> 8;
- // SLA doesn't fill lower bit
- goto shift_comm;
-
- case 0x0F: // RRCA
- case 0x1F: // RRA
- data = op;
- op = rg.a;
- rr_comm:
- op |= (data & flags) << 4; // RR and carry is set
- flags = (op << 4) & c_flag; // C = bit shifted out
- if ( data < 0x10 ) // RRC
- op |= op << 8;
- op >>= 1;
- if ( data & 0x20 ) // SRA propagates sign bit
- op |= (op << 1) & 0x80;
- shift_comm:
- data &= 7;
- if ( !(op & 0xFF) )
- flags |= z_flag;
- if ( data == 6 )
- goto write_hl_op_ff;
- R8( data ) = op;
- goto loop;
-
-// Load
-
- case 0x70: // LD (HL),B
- case 0x71: // LD (HL),C
- case 0x72: // LD (HL),D
- case 0x73: // LD (HL),E
- case 0x74: // LD (HL),H
- case 0x75: // LD (HL),L
- case 0x77: // LD (HL),A
- op = R8( op & 7 );
- write_hl_op_ff:
- WRITE( rp.hl, op & 0xFF );
- goto loop;
-
- case 0x41: case 0x42: case 0x43: case 0x44: case 0x45: case 0x47: // LD r,r
- case 0x48: case 0x4A: case 0x4B: case 0x4C: case 0x4D: case 0x4F:
- case 0x50: case 0x51: case 0x53: case 0x54: case 0x55: case 0x57:
- case 0x58: case 0x59: case 0x5A: case 0x5C: case 0x5D: case 0x5F:
- case 0x60: case 0x61: case 0x62: case 0x63: case 0x65: case 0x67:
- case 0x68: case 0x69: case 0x6A: case 0x6B: case 0x6C: case 0x6F:
- case 0x78: case 0x79: case 0x7A: case 0x7B: case 0x7C: case 0x7D:
- R8( (op >> 3) & 7 ) = R8( op & 7 );
- goto loop;
-
- case 0x08: // LD IND16,SP
- data = GET_ADDR();
- pc += 2;
- WRITE( data, sp&0xFF );
- data++;
- WRITE( data, sp >> 8 );
- goto loop;
-
- case 0xF9: // LD SP,HL
- sp = rp.hl;
- goto loop;
-
- case 0x31: // LD SP,IMM
- sp = GET_ADDR();
- pc += 2;
- goto loop;
-
- case 0x01: // LD BC,IMM
- case 0x11: // LD DE,IMM
- r16 [op >> 4] = GET_ADDR();
- pc += 2;
- goto loop;
-
- {
- unsigned temp;
- case 0xE0: // LD (0xFF00+imm),A
- temp = data | 0xFF00;
- pc++;
- goto write_data_rg_a;
-
- case 0xE2: // LD (0xFF00+C),A
- temp = rg.c | 0xFF00;
- goto write_data_rg_a;
-
- case 0x32: // LD (HL-),A
- temp = rp.hl;
- rp.hl = temp - 1;
- goto write_data_rg_a;
-
- case 0x02: // LD (BC),A
- temp = rp.bc;
- goto write_data_rg_a;
-
- case 0x12: // LD (DE),A
- temp = rp.de;
- goto write_data_rg_a;
-
- case 0x22: // LD (HL+),A
- temp = rp.hl;
- rp.hl = temp + 1;
- goto write_data_rg_a;
-
- case 0xEA: // LD IND16,A (common)
- temp = GET_ADDR();
- pc += 2;
- write_data_rg_a:
- WRITE( temp, rg.a );
- goto loop;
- }
-
- case 0x06: // LD B,IMM
- rg.b = data;
- pc++;
- goto loop;
-
- case 0x0E: // LD C,IMM
- rg.c = data;
- pc++;
- goto loop;
-
- case 0x16: // LD D,IMM
- rg.d = data;
- pc++;
- goto loop;
-
- case 0x1E: // LD E,IMM
- rg.e = data;
- pc++;
- goto loop;
-
- case 0x26: // LD H,IMM
- rg.h = data;
- pc++;
- goto loop;
-
- case 0x2E: // LD L,IMM
- rg.l = data;
- pc++;
- goto loop;
-
- case 0x36: // LD (HL),IMM
- WRITE( rp.hl, data );
- pc++;
- goto loop;
-
- case 0x3E: // LD A,IMM
- rg.a = data;
- pc++;
- goto loop;
-
-// Increment/Decrement
-
- case 0x03: // INC BC
- case 0x13: // INC DE
- case 0x23: // INC HL
- r16 [op >> 4]++;
- goto loop;
-
- case 0x33: // INC SP
- sp = (sp + 1) & 0xFFFF;
- goto loop;
-
- case 0x0B: // DEC BC
- case 0x1B: // DEC DE
- case 0x2B: // DEC HL
- r16 [op >> 4]--;
- goto loop;
-
- case 0x3B: // DEC SP
- sp = (sp - 1) & 0xFFFF;
- goto loop;
-
- case 0x34: // INC (HL)
- op = rp.hl;
- data = READ( op );
- data++;
- WRITE( op, data & 0xFF );
- goto inc_comm;
-
- case 0x04: // INC B
- case 0x0C: // INC C (common)
- case 0x14: // INC D
- case 0x1C: // INC E
- case 0x24: // INC H
- case 0x2C: // INC L
- case 0x3C: // INC A
- op = (op >> 3) & 7;
- R8( op ) = data = R8( op ) + 1;
- inc_comm:
- flags = (flags & c_flag) | (((data & 15) - 1) & h_flag) | ((data >> 1) & z_flag);
- goto loop;
-
- case 0x35: // DEC (HL)
- op = rp.hl;
- data = READ( op );
- data--;
- WRITE( op, data & 0xFF );
- goto dec_comm;
-
- case 0x05: // DEC B
- case 0x0D: // DEC C
- case 0x15: // DEC D
- case 0x1D: // DEC E
- case 0x25: // DEC H
- case 0x2D: // DEC L
- case 0x3D: // DEC A
- op = (op >> 3) & 7;
- data = R8( op ) - 1;
- R8( op ) = data;
- dec_comm:
- flags = (flags & c_flag) | n_flag | (((data & 15) + 0x31) & h_flag);
- if ( data & 0xFF )
- goto loop;
- flags |= z_flag;
- goto loop;
-
-// Add 16-bit
-
- {
- blargg_ulong temp; // need more than 16 bits for carry
- unsigned prev;
-
- case 0xF8: // LD HL,SP+imm
- temp = BOOST::int8_t (data); // sign-extend to 16 bits
- pc++;
- flags = 0;
- temp += sp;
- prev = sp;
- goto add_16_hl;
-
- case 0xE8: // ADD SP,IMM
- temp = BOOST::int8_t (data); // sign-extend to 16 bits
- pc++;
- flags = 0;
- temp += sp;
- prev = sp;
- sp = temp & 0xFFFF;
- goto add_16_comm;
-
- case 0x39: // ADD HL,SP
- temp = sp;
- goto add_hl_comm;
-
- case 0x09: // ADD HL,BC
- case 0x19: // ADD HL,DE
- case 0x29: // ADD HL,HL
- temp = r16 [op >> 4];
- add_hl_comm:
- prev = rp.hl;
- temp += prev;
- flags &= z_flag;
- add_16_hl:
- rp.hl = temp;
- add_16_comm:
- flags |= (temp >> 12) & c_flag;
- flags |= (((temp & 0x0FFF) - (prev & 0x0FFF)) >> 7) & h_flag;
- goto loop;
- }
-
- case 0x86: // ADD (HL)
- data = READ( rp.hl );
- goto add_comm;
-
- case 0x80: // ADD B
- case 0x81: // ADD C
- case 0x82: // ADD D
- case 0x83: // ADD E
- case 0x84: // ADD H
- case 0x85: // ADD L
- case 0x87: // ADD A
- data = R8( op & 7 );
- goto add_comm;
-
- case 0xC6: // ADD IMM
- pc++;
- add_comm:
- flags = rg.a;
- data += flags;
- flags = ((data & 15) - (flags & 15)) & h_flag;
- flags |= (data >> 4) & c_flag;
- rg.a = data;
- if ( data & 0xFF )
- goto loop;
- flags |= z_flag;
- goto loop;
-
-// Add/Subtract
-
- case 0x8E: // ADC (HL)
- data = READ( rp.hl );
- goto adc_comm;
-
- case 0x88: // ADC B
- case 0x89: // ADC C
- case 0x8A: // ADC D
- case 0x8B: // ADC E
- case 0x8C: // ADC H
- case 0x8D: // ADC L
- case 0x8F: // ADC A
- data = R8( op & 7 );
- goto adc_comm;
-
- case 0xCE: // ADC IMM
- pc++;
- adc_comm:
- data += (flags >> 4) & 1;
- data &= 0xFF; // to do: does carry get set when sum + carry = 0x100?
- goto add_comm;
-
- case 0x96: // SUB (HL)
- data = READ( rp.hl );
- goto sub_comm;
-
- case 0x90: // SUB B
- case 0x91: // SUB C
- case 0x92: // SUB D
- case 0x93: // SUB E
- case 0x94: // SUB H
- case 0x95: // SUB L
- case 0x97: // SUB A
- data = R8( op & 7 );
- goto sub_comm;
-
- case 0xD6: // SUB IMM
- pc++;
- sub_comm:
- op = rg.a;
- data = op - data;
- rg.a = data;
- goto sub_set_flags;
-
- case 0x9E: // SBC (HL)
- data = READ( rp.hl );
- goto sbc_comm;
-
- case 0x98: // SBC B
- case 0x99: // SBC C
- case 0x9A: // SBC D
- case 0x9B: // SBC E
- case 0x9C: // SBC H
- case 0x9D: // SBC L
- case 0x9F: // SBC A
- data = R8( op & 7 );
- goto sbc_comm;
-
- case 0xDE: // SBC IMM
- pc++;
- sbc_comm:
- data += (flags >> 4) & 1;
- data &= 0xFF; // to do: does carry get set when sum + carry = 0x100?
- goto sub_comm;
-
-// Logical
-
- case 0xA0: // AND B
- case 0xA1: // AND C
- case 0xA2: // AND D
- case 0xA3: // AND E
- case 0xA4: // AND H
- case 0xA5: // AND L
- data = R8( op & 7 );
- goto and_comm;
-
- case 0xA6: // AND (HL)
- data = READ( rp.hl );
- pc--;
- case 0xE6: // AND IMM
- pc++;
- and_comm:
- rg.a &= data;
- case 0xA7: // AND A
- flags = h_flag | (((rg.a - 1) >> 1) & z_flag);
- goto loop;
-
- case 0xB0: // OR B
- case 0xB1: // OR C
- case 0xB2: // OR D
- case 0xB3: // OR E
- case 0xB4: // OR H
- case 0xB5: // OR L
- data = R8( op & 7 );
- goto or_comm;
-
- case 0xB6: // OR (HL)
- data = READ( rp.hl );
- pc--;
- case 0xF6: // OR IMM
- pc++;
- or_comm:
- rg.a |= data;
- case 0xB7: // OR A
- flags = ((rg.a - 1) >> 1) & z_flag;
- goto loop;
-
- case 0xA8: // XOR B
- case 0xA9: // XOR C
- case 0xAA: // XOR D
- case 0xAB: // XOR E
- case 0xAC: // XOR H
- case 0xAD: // XOR L
- data = R8( op & 7 );
- goto xor_comm;
-
- case 0xAE: // XOR (HL)
- data = READ( rp.hl );
- pc--;
- case 0xEE: // XOR IMM
- pc++;
- xor_comm:
- data ^= rg.a;
- rg.a = data;
- data--;
- flags = (data >> 1) & z_flag;
- goto loop;
-
- case 0xAF: // XOR A
- rg.a = 0;
- flags = z_flag;
- goto loop;
-
-// Stack
-
- case 0xF1: // POP FA
- case 0xC1: // POP BC
- case 0xD1: // POP DE
- case 0xE1: // POP HL (common)
- data = READ( sp );
- r16 [(op >> 4) & 3] = data + 0x100 * READ( sp + 1 );
- sp = (sp + 2) & 0xFFFF;
- if ( op != 0xF1 )
- goto loop;
- flags = rg.flags & 0xF0;
- goto loop;
-
- case 0xC5: // PUSH BC
- data = rp.bc;
- goto push;
-
- case 0xD5: // PUSH DE
- data = rp.de;
- goto push;
-
- case 0xE5: // PUSH HL
- data = rp.hl;
- goto push;
-
- case 0xF5: // PUSH FA
- data = (flags << 8) | rg.a;
- goto push;
-
-// Flow control
-
- case 0xFF:
- if ( pc == idle_addr + 1 )
- goto stop;
- case 0xC7: case 0xCF: case 0xD7: case 0xDF: // RST
- case 0xE7: case 0xEF: case 0xF7:
- data = pc;
- pc = (op & 0x38) + rst_base;
- goto push;
-
- case 0xCC: // CZ
- pc += 2;
- if ( flags & z_flag )
- goto call;
- goto loop;
-
- case 0xD4: // CNC
- pc += 2;
- if ( !(flags & c_flag) )
- goto call;
- goto loop;
-
- case 0xDC: // CC
- pc += 2;
- if ( flags & c_flag )
- goto call;
- goto loop;
-
- case 0xD9: // RETI
- //interrupts_enabled = 1;
- goto ret;
-
- case 0xC0: // RZ
- if ( !(flags & z_flag) )
- goto ret;
- goto loop;
-
- case 0xD0: // RNC
- if ( !(flags & c_flag) )
- goto ret;
- goto loop;
-
- case 0xD8: // RC
- if ( flags & c_flag )
- goto ret;
- goto loop;
-
- case 0x18: // JR
- BRANCH( true )
-
- case 0x30: // JR NC
- BRANCH( !(flags & c_flag) )
-
- case 0x38: // JR C
- BRANCH( flags & c_flag )
-
- case 0xE9: // JP_HL
- pc = rp.hl;
- goto loop;
-
- case 0xC3: // JP (next-most-common)
- pc = GET_ADDR();
- goto loop;
-
- case 0xC2: // JP NZ
- pc += 2;
- if ( !(flags & z_flag) )
- goto jp_taken;
- goto loop;
-
- case 0xCA: // JP Z (most common)
- pc += 2;
- if ( !(flags & z_flag) )
- goto loop;
- jp_taken:
- pc -= 2;
- pc = GET_ADDR();
- goto loop;
-
- case 0xD2: // JP NC
- pc += 2;
- if ( !(flags & c_flag) )
- goto jp_taken;
- goto loop;
-
- case 0xDA: // JP C
- pc += 2;
- if ( flags & c_flag )
- goto jp_taken;
- goto loop;
-
-// Flags
-
- case 0x2F: // CPL
- rg.a = ~rg.a;
- flags |= n_flag | h_flag;
- goto loop;
-
- case 0x3F: // CCF
- flags = (flags ^ c_flag) & ~(n_flag | h_flag);
- goto loop;
-
- case 0x37: // SCF
- flags = (flags | c_flag) & ~(n_flag | h_flag);
- goto loop;
-
- case 0xF3: // DI
- //interrupts_enabled = 0;
- goto loop;
-
- case 0xFB: // EI
- //interrupts_enabled = 1;
- goto loop;
-
-// Special
-
- case 0xDD: case 0xD3: case 0xDB: case 0xE3: case 0xE4: // ?
- case 0xEB: case 0xEC: case 0xF4: case 0xFD: case 0xFC:
- case 0x10: // STOP
- case 0x27: // DAA (I'll have to implement this eventually...)
- case 0xBF:
- case 0xED: // Z80 prefix
- case 0x76: // HALT
- s.remain++;
- goto stop;
- }
-
- // If this fails then the case above is missing an opcode
- assert( false );
-
-stop:
- pc--;
-
- // copy state back
- STATIC_CAST(core_regs_t&,r) = rg;
- r.pc = pc;
- r.sp = sp;
- r.flags = flags;
-
- this->state = &state_;
- memcpy( &this->state_, &s, sizeof this->state_ );
-
- return s.remain > 0;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-29 07:23:53 +0000